Question

数学。简便方法计算，快，釆纳。

Answer 1

0.4*2.5*9.6=9.6；
0.038*（5*0.6）=0.118；
10.5*（8.3+1.7）=105；
100*0.85+2*0.85=86.7；
3.29*（99+1）=329
0.72*100-0.72*2=70.56；
口算可能出错，但是算法没错，自己验证一遍答案吧

Answer 2

Answer 3

0.4*2.5*9.6=1*9.6=9.6
0.038*5*0.6=0.038*3=0.114
10.5*8.3+10.5*1.7=10.5*（8.3+1.7）=10.5*10=105
102*0.85=100*0.85+2*0.85=85+1.7=86.7
3.29*99+3.29=3.29*（99+1）=3.29*100=329
0.72*98=0.72*100-0.72*2=72-1.44=70.56

Answer 4

0.4x9.6x2.5
=(0.4x2.5)x9.6
=1x9.6
=9.6

0.038x5x0.6
=0.038x3
=0.114

10.5x8.3+10.5x1.7
=10.5x(8.3+1.8)
=10.5x10
=105

102x0.85
=(100+2)x0.85
=85+1.7
=86.7

3.29x99+3.29
=3.29x(99+1)
=3.29x100
=329

0.72x98
=0.72x(100-2)
=72-1.44
=70.56